Twitter Gets Their Venture Round

Twitter has raised a round of financing, led by Union Square Ventures. The size of the round has not been disclosed (yet), but additional investors include Charles River Ventures, Marc Andreessen, Dick Costolo, Ron Conway, and Naval Ravikant.

The service, which has around 300,000 users, has grown rapidly in recent months. Pownce, Kyte and others are competitors.

Update: It sounds like the company had a strong talk with investors about not disclosing the size of the round or any other particulars. No one’s talking, other than to narrow it down to betwen $1 – $5 million.